Reversing mechanism for steam-engines.



G. B. PETSGHR REVERSING MECHANISM FOR STEAM ENGINES.

APPLICATION rum) 00120, 1905.

972,402. Patented Oct-1 1, 1910.

3 SHBETS-SHEET 1.

Y WIT 8858:

' ATTORNEY.

n1: NORRIS PETERS czu. WASHINGTON, n. c,

G. B. PETSGHE. REVERSING MECHANISM FOR STEAM ENGINES. APPLICATION NLRB 001'. 20, 1905.

s SHEETS-SHBET 2.

WIT mks.- mvEr/m ar mfiw JTTORNEF.

THE NORRIS PETERS co.,'w.qsnmcra-, 04 c.

Patented Oct. 11, 191 0.

G. B. PETSOHB.

REVERSING MECHANISM FOR STEAM ENGINES.

APPLICATION FILED 001'. 20, 1906.

Patented Oct. 11, 1910.

3 SHEETS-SHEET 3 A willy/17117112 I a f WITNESSES yfky.

A TTURNEY.

THE mum's ps-rzrzs 00., WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

GUSTAV BERNHARD PETSCHE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE SOUTI-IWARK FOUNDRY & MACHINE COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

REVERSING MECHANISM FOR STEAM-ENGINES.

To all whom it may concern:

Be it known that I, GUs'rAv B. PETSOHE, a subject of the Emperor of Germany, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Reversing Mechanism for Steam- Engines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to steam engines, particularly to that class known as reversing engines and used in rolling mills, and it has for its object to provide mechanism whereby the throttle valve controlling the admission of steam to the engine will be automatically closed during the adjustment of the engine valves to reverse the engine and opened as the reversing operation is completed.

By preference I effect the shifting of the valves to reverse the engine through a reversing cylinder and piston, the cylinder having a valve which controls its admission and exhaust which valve is directly actuated by the reversing lever aforesaid.

My invention consists in certain features of construction and arrangement, which are pointed out in detail in the claims annexed to and forming a part of this specification.

The nature of the invention and its general purpose will be best understood as a whole as described in connection with the drawings in which it is illustrated in connection with a compound reversing engine, the valve actuating mechanism of which is also new with me and forms the subject matter of my co-pending application for Letters Patent filed October 20th, 1905 Serial Number 283,579.

In these drawings: Figure 1, is a plan view of the engine with my improvements applied thereto. Fig. 2, a side elevation of: the engine. Fig. 3, a longitudinal vertical section through the reversing cylinder and its connections and attachments. Fig. 4 is a front elevation of the throttle valve and its actuating mechanism, and Fig. 5, a section through the valve and its mechanism on the line 55 of Fig. 4.

A, is the low pressure and B, the high pressure cylinder of the engine, the piston Specification of LettersPatent.

Application filed October 20, 1905.

Patented Oct. 11, 1910.

Serial No. 283,580.

rod of'the low pressure cylinder being indicated at A, and shown as coupled through a cross-head C, and connecting rod C, with the crank C of the engine shaft D.

E, E, are parallel eccentrics secured on the shaft D, on either side of an angularly set eccentric F. Of these eccentrics, those marked E, E, are coupled by rods E, with the lug G, at the upper end of the valve 1 and rod I while the block J, is connected with the valve of the high pressure cylinder through the rod J, rock lever J rod J rock lever J and rod J The link blocks are adjusted in the link through connecting rods M, L, connected respectively to levers L, M, pivoted on the-shaft K, and provided with counterweights L M and also with angularly set lever arms L M which in turnare connected through rods L M and sliding clamping heads L, M, with the slotted levers N, N, which are firmly secured to a rock shaft 0, having a lever arm 0, which in turn is connected through rods 0 with the crosshead P, which, as shown in Fig. 3, is connected with the piston rod P attached to a piston P", moving in the reversing cylinder P, an extension P of the rod having attached to it a plunger P which moves between adjustable stop heads R, R, preferably formed as shown and cylindrical cavities adapted to receive theplunger and provided with restricted air escapes, as indicated at R R The stop heads R, R, are held in position and adjusted by means of the right and left threaded rods R by their heads R R and having attached to them worm wheels Rf", R, which are engaged by appropriate wormson a shaft R, which extends up into the operators bridge and is provided with the usual hand wheel, as shown in Fig. 2. Steam admission and exhaust to the reversing cyli-nder P, is effected by the motion of the valve Q, actuated through the connection indicated at Q.

To the extent above described, the engine 5 illustrated is that described and, to the extent of its novelty, claimed in my before mentioned co-pending application. The movement of the piston in the reversing cylinder effecting the oscillatory movement on the slotted levers N, N, and through them and the connections described, shifting the link blocks from one side of the center of the link to the other with a consequent shifting of the connected valves to reverse the engine, the cut off of both connected valves being simultaneously regulated by the adjustment of the stop blocks R, R, which regulate the amount of movement of the piston P, in the reversing cylinder and conse- 2 quently the extent of the oscillatory movement of the levers N, N, and of the parts connected therewith, the device also providing for the independent regulation of the cut-off of either cylinder by the adjustment 2 of the sliding heads L M in the slotted I levers N, N.

Passing now to a description of the parts directly connected with my present invention, it will be seen that the valve actuating rod Q, of the reversing cylinder P, is connected through a lever arm Q with the reversing lever Q}, pivoted at Q and having an arm Q which through rod Q, the pivoted levers indicated at Q], and rod Q, is

connected to actuate the throttle valve of the engine indicated at T, said throttle valve being in the steam supply pipe S, S, indicating the receiver connecting the high and low pressure cylinders.

40 The connection of the reversing lever with the throttle valve is such that the valve will be closed in the intermediate position of the lever and opened as the lever is shifted in either direction from such intermediate position. My preferred construction is that shown in the drawings in which the rod Q, is connected to a lever arm T secured to a rock shaft T to which is also secured a link T of a togglerjoint valve actuating device,

said link being pivotally connected with the other link T of the device which, as shown, is coupled to the valve stem. The construction and connection being such that the valve is closed when the links of the toggle joint are in parallel position or alinement and opened as the toggle joint links move in either direction from such parallel position. By preference I provide a locking detent which will engage'and hold the links in alinement and consequently hold the valve closed, this device, as illustrated, consisting of a i segment T secured to the rock shaft T and having a notch T and a detent which, as shown, consists of a lever T pivoted on arms T secured to the standards T, which support the shaft T the lever being properly weighted and having a roller T, which rides on the segment T and engages the notch T, when the toggle joint members are in alinement.

The toggle oint valve actuating device is shown as connected with a sliding head T, moving in a guideway T, and connected to a valve spindle T supporting the cylindrical valve T moving in a cylinder T, which'connects the supply main S with the steam pipe S, and when moved downward comes in contact with the seat indicated at T It will be seen that when the reversing lever Q}, is shifted to intermediate position the toggle valve actuating device will have its members brought into alinement and the valve will be closed and held closed by the engagement of the detent with a notched segment, also that the shifting of the reversing lever in either direction will cause the toggle members of the valve actuating mechanism to assume an angular position to each other and will open the throttle valve, while at the same time steam will be admitted to one side or the other of the reversing cylinder and the reversal of the valves accomplished through the mechanism described.

The throttle valve construction shown in Figs. 4 and 5 involves the invention which forms the subject matter of my co-pendim application filed October 20th, 1905, Seria Number 283,581.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a reversing engine, a lever connected to shift the valve actuating mechanism and reverse the engine, in combination with a throttle valve for regulating the admission of steam to the engine, means connecting the reversing lever aforesaid with said throttle valve whereby said valve is closed in the intermediate position of the lever and gradually opened as the lever moves in either direction from said intermediate position, and an automatic detent acting to engage the valve actuating connection and hold the valve in closed position.

2. In a reversing engine, a throttle valve in combination with a toggle joint mechanism for opening and closing said valve, said mechanism being arranged to close the valve when its jointed links are in alinement and to open it when the said jointed links are moved out of alinement in either direction, means for shifting the engine valves to reverse the motion of the engine, a reversing lever for actuating said means, and connections from said lever to the toggle joint actuating device of the throttle valve whereby its jointed links are moved to parallel position and the valve closed when the lever is in ii'itermediate position and whereby the I shifting of the lever in either direction acts l to move the jointed links from said parallel position and open the valve.

In a reversing engine, a throttle valve in combination with a toggle joint mechanism for opening and closing said valve, said mechanism being arranged to close the valve when its jointed links are in alinement and to open it when the said jointed links are moved out of alinement in either direction, a notched segment moving with one of the jointed links, a detent supported on said segment and arranged to engage the notch therein when the valve is closed, means for shifting the engine valves to reverse the motion of the engine, a reversing lever for actuating said means, and connections from said lever to the toggle joint actuating device of the throttle valve whereby its jointed links are moved to parallel position and the valve closed when the lever is in intermediate position and whereby the shifting of the lever in either direction acts to move the jointed links from said parallel position and open the valve.

GUSTAV BERNHARD PETSOHE. Witnesses ARNOLD KATZ, D. STEWART. 

